A field test method for performance of mixed explosives

Abstract

The present invention discloses a method for field testing the performance of mixed explosives, comprising the following steps: S1, conducting blasting tests on different rock masses using different mixed emulsion explosives; calculating the blast fragmentation by image binarization and contour recognition using a statistical method for explosive pile size distribution based on image processing technology; and measuring the blasting fly rock velocity using a high-speed camera to calculate the blasting energy dissipation rate. The method can determine the effects of mixed explosives of different densities, different detonation velocities, and different intensities on different rocks and different rock structural characteristics, facilitating the subsequent selection of explosives based on rock characteristics, and providing a good reference guide.

Description

Technical Field

[0001] The invention relates to the technical field of mixed explosives, in particular to a field test method for mixed explosive performance. Background Art

[0002] Mixing explosives on-site offers advantages such as ready-to-use mixing, shortened construction time, reduced risks associated with long-distance transportation and repetitive loading and unloading, and reduced blasting costs. The blasting effectiveness of explosives varies for rocks with different lithologies and structural characteristics. Currently, research on mixed emulsion explosive formulations is limited and cannot meet the personalized requirements for grading control in mining rocks with different lithologies and structural characteristics. Furthermore, the interaction mechanism between rock mass structural characteristics and explosive performance is unclear, making it impossible to establish a model for the relationship between explosives and rock breaking to demonstrate specific explosive performance (density, detonation velocity, or intensity). Summary of the Invention

[0003] The purpose of the present invention is to solve the shortcomings of the prior art and to propose a field test method for the performance of mixed explosives.

[0004] In order to achieve the above object, the present invention adopts the following technical solutions:

[0005] A method for field testing performance of mixed explosives comprises the following steps:

[0006] S1. Blasting tests were conducted on different rock masses using different mixed emulsion explosives. A statistical method for blast pile size distribution based on image processing technology was used to calculate blast fragmentation through image binarization and contour recognition. High-speed photography was used to measure the velocity of blasting flystones and calculate the blasting energy dissipation rate.

[0007] S2. Using ANSYS / LS-DYNA numerical simulation software, the energy dissipation characteristics and failure modes of rocks with different lithologies and structural characteristics under different blast loads were studied. By varying the properties of rock masses with different lithologies and structural characteristics and using different explosive performance parameters, rock blasting models under different blast load conditions were constructed. The effects of different blasting loads on the propagation of blast stress waves, energy dissipation, and fragmentation distribution of rocks with different lithologies and structural characteristics were analyzed to obtain the interaction between the dynamic response of rock structural characteristics and explosive performance.

[0008] S3. Using the nonlinear function analysis method based on fuzzy optimization theory, a model of the interaction between rocks with different lithology and structural characteristics and explosive performance is constructed to reveal the interaction mechanism between rock structure characteristics and explosive performance.

[0009] Preferably, the different lithologies include sandstone, limestone, and mudstone, and the rock masses with different structural characteristics include sandstone with different joint structural characteristics and sandstone with different cave structural characteristics.

[0010] Preferably, the sandstones with different joint structural characteristics include sandstones with different numbers of joints, sandstones with different joint angles, and sandstones with different joint spacings; the sandstones with different cave structural characteristics include sandstones with different cave sizes, sandstones with different cave shapes, and sandstones with different cave locations.

[0011] Preferably, the sandstones with different joint structural characteristics are simulated by burying cardboard in different numbers, angles and spacings in the test pieces when making the model to simulate the closed joints of the rock mass; the sandstones with different cave structural characteristics are simulated by customizing hollow plastics of different sizes and shapes and burying them in the test pieces when making the model to simulate the cave structure.

[0012] Preferably, the performance parameters of the different explosives are obtained through a composite oil phase property optimization test, which includes an oil phase physicochemical test, a composite oil phase property test, and a composite oil phase ratio test. The oil phase physicochemical test can obtain parameters such as HLB value, acid value, melting point, needle penetration, and carbon number distribution. The composite oil phase property test can obtain parameters such as viscosity, surface tension, and molecular structure. The composite oil phase ratio test includes base oil and emulsifier.

[0013] Preferably, the different explosive performance parameters include mixed explosives of different densities, mixed explosives of different detonation velocities, and mixed explosives of different intensities.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] In the present invention, blasting tests are carried out on different rock masses by using different mixed emulsion explosives; a statistical method for explosive pile size distribution based on image processing technology is adopted to calculate the blasting fragmentation through image binarization and contour recognition; a high-speed camera is used to measure the throwing velocity of blasting flying rocks and calculate the blasting energy dissipation rate; and based on ANSYS / LS-DYNA numerical simulation software, energy dissipation characteristics and failure modes of rocks with different lithologies and different structural characteristics under different blast loads are studied; and a relationship between rocks and mixed explosives can be established, so that the effects of mixed explosives with different densities, mixed explosives with different detonation velocities, and mixed explosives with different intensities on different rocks and different rock structural characteristics can be obtained, which facilitates the selection of explosives according to rock characteristics in the later stage and has a good reference and guiding role. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a block diagram of the composition of a mixed explosive performance field test method proposed by the present invention. DETAILED DESCRIPTION

[0017] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0018] Reference Figure 1 A method for field testing the performance of mixed explosives comprises the following steps:

[0019] S1. Blasting tests were conducted on different rock masses using different mixed emulsion explosives. A statistical method for blast pile size distribution based on image processing technology was used to calculate blast fragmentation through image binarization and contour recognition. High-speed photography was used to measure the velocity of blasting flystones and calculate the blasting energy dissipation rate.

[0020] S2. Using ANSYS / LS-DYNA numerical simulation software, the energy dissipation characteristics and failure modes of rocks with different lithologies and structural characteristics under different blast loads were studied. By varying the properties of rock masses with different lithologies and structural characteristics and using different explosive performance parameters, rock blasting models under different blast load conditions were constructed. The effects of different blasting loads on the propagation of blast stress waves, energy dissipation, and fragmentation distribution of rocks with different lithologies and structural characteristics were analyzed to obtain the interaction between the dynamic response of rock structural characteristics and explosive performance.

[0021] S3. Using the nonlinear function analysis method based on fuzzy optimization theory, a model of the interaction between rocks with different lithology and structural characteristics and explosive performance is constructed to reveal the interaction mechanism between rock structure characteristics and explosive performance.

[0022] Different rock types include sandstone, limestone, and mudstone. Rock masses with different structural characteristics include sandstone with different joint structural characteristics and sandstone with different cave structural characteristics. Sandstone with different joint structural characteristics includes sandstone with different joint numbers, sandstone with different joint angles, and sandstone with different joint spacings. Sandstone with different cave structural characteristics includes sandstone with different cave sizes, sandstone with different cave shapes, and sandstone with different cave locations. Sandstone with different joint structural characteristics is simulated by burying cardboard in different numbers, angles, and spacings in the specimens when making the model to simulate closed joints of the rock mass. Sandstone with different cave structural characteristics is simulated by customizing hollow plastics of different sizes and shapes and burying them in the specimens when making the model to simulate cave structures.

[0023] The performance parameters of different explosives are obtained through composite oil phase property optimization tests. The composite oil phase property optimization tests include oil phase physicochemical tests, composite oil phase property tests, and composite oil phase ratio tests. The oil phase physicochemical tests can obtain parameters such as HLB value, acid value, melting point, needle penetration, and carbon number distribution. The composite oil phase property tests can obtain parameters such as viscosity, surface tension, and molecular structure. The composite oil phase ratio tests include base oil and emulsifier. The performance parameters of different explosives include mixed explosives with different densities, mixed explosives with different detonation velocities, and mixed explosives with different intensities.

[0024] Working principle: In the present invention, different mixed emulsion explosives are used to carry out blasting tests on different rock masses; a statistical method of explosive pile size distribution based on image processing technology is adopted to calculate the blasting fragmentation through image binarization and contour recognition; a high-speed camera is used to measure the throwing velocity of blasting flying rocks and calculate the blasting energy dissipation rate; based on ANSYS / LS-DYNA numerical simulation software, the energy dissipation characteristics and failure modes of rocks with different lithology and different structural characteristics under different blast loads are studied; the relationship between rock and mixed explosives can be established, so that the effects of mixed explosives with different densities, mixed explosives with different detonation velocities, and mixed explosives with different intensities on different rocks and different rock structural characteristics can be obtained, which is convenient for selecting explosives according to rock characteristics in the later stage and has a good reference and guiding role.

[0025] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A method for field testing the performance of mixed explosives, characterized in that: The following steps are involved: S1. Blasting tests were conducted on different rock masses using different mixed emulsion explosives. A statistical method for blast pile size distribution based on image processing technology was used to calculate blast fragmentation through image binarization and contour recognition. High-speed photography was used to measure the velocity of blasting flystones and calculate the blasting energy dissipation rate. S2. Using ANSYS / LS-DYNA numerical simulation software, we studied the energy dissipation characteristics and failure modes of rocks with different lithologies and structural characteristics under different blasting loads. By changing the properties of rock masses with different lithologies and structural characteristics and using different explosive performance parameters, we constructed rock blasting models under different blasting load conditions. We analyzed the effects of different blasting loads on the propagation of blast stress waves, energy dissipation, and fragmentation distribution of rocks with different lithologies and structural characteristics, and obtained the interaction between the dynamic response of rock structural characteristics and explosive performance. The different lithologies include sandstone, limestone, and mudstone, and the rock masses with different structural characteristics include sandstone with different joint structural characteristics and sandstone with different karst cave structural characteristics; The performance parameters of different explosives include mixed explosives with different densities, mixed explosives with different detonation velocities, and mixed explosives with different intensities; S3. Using the nonlinear function analysis method based on fuzzy optimization theory, a model of the interaction between rocks with different lithology and structural characteristics and explosive performance is constructed to reveal the interaction mechanism between rock structure characteristics and explosive performance.

2. A mixed explosive performance field test method according to claim 1, characterized in that: The sandstones with different joint structural characteristics include sandstones with different numbers of joints, sandstones with different joint angles, and sandstones with different joint spacings. The sandstones with different cave structural characteristics include sandstones with different cave sizes, sandstones with different cave shapes, and sandstones with different cave locations.

3. A mixed explosive performance field test method according to claim 2, characterized in that: The sandstones with different joint structural characteristics are simulated by burying cardboard in different numbers, angles and spacings in the test pieces when making the model to simulate the closed joints of the rock mass; the sandstones with different cave structural characteristics are simulated by customizing hollow plastics of different sizes and shapes and burying them in the test pieces when making the model to simulate the cave structure.

4. A mixed explosive performance field test method according to claim 1, characterized in that: The performance parameters of different explosives are obtained through a composite oil phase property optimization test, which includes an oil phase physicochemical test, a composite oil phase property test, and a composite oil phase ratio test. The oil phase physicochemical test can obtain HLB value, acid value, melting point, needle penetration, and carbon number distribution parameters. The composite oil phase property test can obtain viscosity, surface tension, and molecular structure parameters. The composite oil phase ratio test includes base oil and emulsifier.

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